Great Hall

Eating and relaxing in a Great Hall will significantly improve Duplicants' Morale

Requirements

 * At least one Mess Table
 * No industrial machinery
 * Minimum size 32 tiles
 * Maximum size 120 tiles
 * Decor item: 20+ decor (minimum of 1 item with decor rating 20+)
 * Recreational Building

Reward
Morale Bonus: +6
 * This buff is obtained by having the Duplicants eat in the Great Hall - there is no other way to do so. Therefore, this bonus is mutually exclusive from the Mess Hall bonus.

Tips

 * The Great Hall is the upgraded version of the Mess Hall. A Bluff Briar will meet the decor requirement even if you do not have an Artist duplicants. A Water Cooler will meet the recreation item requirement. These requirements are actually quite easy to meet in the early game.
 * (See screenshot #2) If the intention is for the Duplicants to just eat at this hall and not hang around in it, disable the Water Cooler and have another room with a functional Recreation machine.
 * A Recreation Room can be upgraded into a Great Hall by putting an unused mess table inside it (see screenshot #1):
 * Unfortunately, in order to get the buff, Duplicants must eat their meals in the Great Hall. Hanging out during downtimes won't grant this buff.